No, you guys are getting confused. Just because your logged in to the golden box doesn't mean you can post. If you log into the yellow box all it does is let you reset your character and the other stuff it says. You can only post by logging into the box that says "Welcome Guest, please sign in or register."
EDIT: Holy Poop! I just figured out what was wrong! In safari settings I once went to 'Accept Cookies' and said never which made me unable to log in! YAY!!! Salvation at last! -Plays chorus in the background- MY LIFE HAS BEEN SAVED!